Advertisement
Simple Lie Detector – Circuit Schematic
Simple Lie Detector
Here`s a simple lie detector that can be built in a few minutes, but can be incredibly useful when you want to know if someone is really telling you the truth. ...
Simple Lie Detector – Circuit Schematic
Simple Lie Detector
Here`s a simple lie detector that can be built in a few minutes, but can be incredibly useful when you want to know if someone is really telling you the truth. ...
Magnetic proximity sensors Circuit – Circuit Schematic
Magnetic proximity sensors Circuit
Here is an interesting circuit for a magnetic proximity switch which can be used in various applications. The magnetic proximity switch circuit, in principle, c...
Bridge Head – Circuit Schematic
Bridge Head
The LDR`s were hand-picked. Got two packages of them from Radio Shack, looking for at least two pairs of similar parts. Then added wire-wrap pin sockets, to the...
Small circuit forms programmable 4- to 20-mA transmitter – Circuit Schematic
Small circuit forms programmable 4- to 20-mA transmitter
One of the key challenges in the design of 4- to 20-mA current transmitters is the voltage-to-current conversion stage. Conventional transmitters use multiple o...
Parallel port provides high-resolution temperature sensing – Circuit Schematic
Parallel port provides high-resolution temperature sensing
The Dallas Semiconductor (www.dalsemi.com) DS1722 digital thermometer allows measurement resolution as fine as 0.0625°C in digital form and with linear respons...
CCD Array Reader Project – Circuit Schematic
CCD Array Reader Project
The CCD Array Reader project began with a free sample of the Texas Instruments TC102-1 CCD Linear Image Sensor and its rather terse data sheet. The TC102-1 prov...
Day and Night Infrared Detection – Circuit Schematic
Day and Night Infrared Detection
The following is a method to allow day and night detection using Infrared/Visible light sensitive phototransistors and a simple LM339 voltage comparator circuit...